2. Reduced renewable curtailment: "The EIM helps avoid renewable curtailment within the ISO, which has both economic and environmental benefits." The total avoided renewable curtailment volume in Q1 2016 was 112,948 MWh, which displaced an estimated 48,342 metric tons of CO2.

3. Reduced flexibility reserves needed: "The EIM facilitates procurement of flexible ramping capacity in the [15 minute market] to address variability that may occur in the [real time dispatch]. Because variability across different BAAs may happen in opposite directions, the flexible ramping requirement for the entire EIM footprint can be less than the sum of individual BAA's requirement." The flexible ramping savings for Q1 2016 was about 35%.

You can read the whole report, including a breakdown of benefits by BAA here.